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【单选题】
人类关于植物病因的认识下面说法错误的是A.
经历了神道论，病害自生论，环境病因论，微生物病原学硕说，多因论等五个阶段
B.
吕氏春秋把小麦黑粉病记为“鬼麦”
C.
De Bery经仔细观察研究，发现了导致爱尔兰大饥荒的罪魁祸首是马铃薯晚疫病，并对其致病性及其发育循环侵染进行了描述，为植物病理学做出了划时代的贡献
D.
植物病害的病原物分三类，分别为真菌，细菌，病毒
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【简答题】Why did the band decide they should operate as a democracy?
【简答题】脑血栓形成的常见病因是（ ）
【单选题】Why did the hard-rock band Greed offer a free downloadable acoustic version of its song?
A.
Because they want to show its loyalty to the fans.
B.
Because they want to get compensation from the public.
C.
Because they want to make new material available on its web site.
D.
Because they want to gain public notice and to attract fans.
【简答题】Why was the band Beatles so popular in America?